Malicious PDF — malware analysis report

Static analysis result for SHA-256 232db9f09e99d4b7…

MALICIOUS

PDF

42.7 KB Created: 2020-04-01 22:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d79865a8d53abf40fc439e1c6511558e SHA-1: fa2199c7e2625fd3fb9fb0d0af17850aa72e081c SHA-256: 232db9f09e99d4b74dfe858d883c926e9eb258862bb2cb7183899f8895257a58
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links to other PDF documents, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The document body contains obfuscated text and references to 'ejercicio de integrales', suggesting a lure to disguise the malicious intent of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://mikeintucson.com/uploads/1/3/0/2/130272631/130272631.html#ejercicio+de+integrales
    • http://vintageflame.net/uploads/1/3/0/5/130544635/723194.pdf
    • http://modernwave.io/uploads/1/3/0/6/130621179/f374a.pdf
    • http://kormexmetals.com/uploads/1/3/0/6/130604258/3081909.pdf
    • http://lakeeriehealth.org/uploads/1/3/0/6/130621459/lawamotazuvebu_nezizozipojawi_wagojiwekokurar_jubipo.pdf
    • http://betteryouhealthgroup.com/uploads/1/3/1/3/131383650/485958.pdf
    • http://njpharmainstitute.com/uploads/1/3/1/1/131164120/add0cd.pdf
    • http://psychicanthon.com/uploads/1/3/0/4/130488357/puwedunumubu_gibajujox.pdf
    • http://goonmud.net/uploads/1/3/0/6/130620670/lofaviridotetox.pdf
    • http://kaybaadu.com/uploads/1/3/0/6/130621579/lozolaz.pdf
    • http://laraslittlehatshop.com/uploads/1/3/0/6/130605381/jagukosiveduku-kupovug-lopamoxe.pdf
    • http://mylisalove.com/uploads/1/3/1/3/131384291/3008711.pdf
    • http://greaterbethelmadison.org/uploads/1/3/0/3/130323159/lerajojoxo.pdf
    • http://staffpicked.com/uploads/1/3/0/8/130814531/tilodasukigorotukag.pdf
    • http://pugetsoundoutcasts.com/uploads/1/3/0/8/130814132/pijunasowekodij_jeruromijezof.pdf
    • http://albatrosshomebuyers.com/uploads/1/3/0/5/130551072/xefazamas-disujonibe-xevazilibisebok-gateza.pdf
    • http://innovation211.com/uploads/1/3/0/2/130291779/gojomanu.pdf
    • http://chiangmaiawards.com/uploads/1/3/0/5/130550841/248982.pdf
    • http://forestermarine.com/uploads/1/3/0/2/130270897/3031495.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cb4.bin
5784c30794152777f831d2b1040734fe1c334a968ef2942e9ed3dbf34dc0bebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB4 8556 bytes

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